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  • 1
    Electronic Resource
    Electronic Resource
    Non-critically phase-matched, Ti:Sapphire-pumped picosecond optical parametric oscillator using LiB3O5 (1995)
    Springer
    Applied physics 60 (1995), S. 443-448 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Rz ; 42.60.Fc ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report a new source of high-repetition rate and widely tunable picosecond pulses for the near infrared. A singly resonant, cw, picosecond optical parametric oscillator based on temperature-tuned LiB3O5 and synchronously pumped by 1.8 ps pulses from a self-mode-locked Ti:Sapphire laser is demonstrated. The oscillator can provide average output powers of up to 90 mW under non-critical type-I phase matching at a pulse repetition rate of 81 MHz. Without dispersion compensation, transform-limited signal pulses with 720 fs durations have been generated at 1.2 times threshold. With the available mirror set, signal tuning over 1.374–1.530 µm and idler tuning over 1.676–1.828 µm is demonstrated for a range of pump wavelengths and phase-matching temperatures. With additional mirrors, continuous tuning throughout 1–2.7 µm should be readily attainable with a single LiB3O5 crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081324
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental investigation and numerical simulation of the influence of resonator-length detuning on the output power, pulse duration and spectral width of a cw mode-locked picosecond optical parametric oscillator (1995)
    Springer
    Applied physics 60 (1995), S. 427-436 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 42.60.Fc ; 02.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on a cw mode-locked non-critically phase matched KTP optical parametric oscillator synchronously pumped by a picosecond Ti:Sapphire laser. High average signal output power of up to 950 mW over a large tuning range has been achieved. For this OPO the influence of resonator-length detuning on the output power, pulse duration and spectral bandwidth has been investigated. The measured data are in good agreement with the results of a numerical simulation using a split-step Fourier method which considers the group-velocity mismatch, the group-velocity dispersion and the self-phase modulation. The numerical simulation also describes the measured strong pump depletion and its influence on the OPO output and efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081322
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  • 3
    Electronic Resource
    Electronic Resource
    Design and application of a femtosecond optical parametric oscillator for time-resolved spectroscopy of semiconductor heterostructures (1995)
    Springer
    Applied physics 60 (1995), S. 459-467 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 42.50.Md ; 71.35. + z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Femtosecond pulses of a collinearly pumped Optical Parametric Oscillator (OPO) are applied for investigations of the carrier dynamics in ternary and quaternary semiconductor quantum wells. The design and the specifications of the OPO are given in detail. We show that no measurable jitter exists between the pump pulses and the output pulses of the OPO. Therefore, it is possible to use the OPO and its pump laser for two-color experiments with a time resolution limited by the pulse lengths. We present and discuss results of transient four-wave mixing experiments on (InGa) As/InP quantum wells, and find a new kind of polarization-dependent quantum beat phenomenon. In addition, non-degenerate experiments on quantum wells from the quaternary (InGaAl) As material system, using two pulses at different wavelengths (one from the OPO and one from the pump laser), are discussed as a novel experimental technique to study carrier trapping into quantum wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081327
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  • 4
    Electronic Resource
    Electronic Resource
    Collinear and non-collinear sum-frequency mixing inβ-BBO for a tunable 195–198 nm all-solid-state laser system (1995)
    Springer
    Applied physics 61 (1995), S. 529-532 
    Details
    ISSN: 1432-0649
    Keywords: 42.50.Ne ; 42.55.Rz ; 42.60.Jf ; 42.60.Mi ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We attained tunable UV laser radiation between 195 and 198 nm by sum-frequency mixing two synchronized flashlamp-pumped solid-state Q-switch lasers, a Nd:YAG laser frequency quadrupled to 266 nm and a tunable (730–770 nm) alexandrite laser. UV pulse energies of 0.12 mJ with repetition rates of 10 Hz were attained in collinear, as well as non-collinear sum-frequency interaction in aβ-Barium Borate (BBO) crystal with a conversion efficiency of 2.5%. Theoretical models for the non-collinear phase-matching interaction were investigated at UV wavelengths below 200 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081285
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  • 5
    Electronic Resource
    Electronic Resource
    Second-harmonic and sum-frequency generation in AgGaSe2 with tunable waveguide CO2 lasers (1995)
    Springer
    Applied physics 61 (1995), S. 291-299 
    Details
    ISSN: 1432-0649
    Keywords: 33.20.Ea ; 33.70.Jg ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A tunable source is described, giving extensive coverage of a spectral region around 2000 cm−1. A frequency self-calibration routine allows for the recording of Doppler-limited absorption profiles with an absolute accuracy of better than 10 MHz. The applicability of the source is demonstrated through measurements on the12C16O,12C17O, and12C18O isotopomers. Collision-broadening parameters and line strengths are determined, some of the data showing evidence of motional narrowing. Sensitivity limits are determined for linear absorption measurements as well as for photoacoustic absorption, and the feasibility of monitoring all three isotopomers with ppm sensitivity is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082049
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  • 6
    Electronic Resource
    Electronic Resource
    High-order harmonic generation in nitrogen molecules with subpicosecond visible dye-laser pulses (1995)
    Springer
    Applied physics 61 (1995), S. 493-498 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 33.80. - b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental study of high-order harmonic generation in nitrogen molecules (N2) has been made using intense visible (616 nm) dye-laser pulses, where the harmonic radiation up to the 21st order is observed. The harmonic distribution represents a plateau that is preceded by an intensity minimum at the 7th order. The harmonic generation characteristics were atomic-like. It has been found that there are some similarities in the high-order harmonic generation characteristics for N2 and Ar, including the highest-order harmonics, harmonic distributions, and the influence of the multiphoton ionization on the high-order harmonic generation. These similarities are reasonably attributed to the energetic correspondence of excited levels and ionization potentials. It is pointed out that the ac Stark shift of excited levels and ionization potentials plays an important role also in the high-order harmonic generation in N2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081279
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  • 7
    Electronic Resource
    Electronic Resource
    Synchronously pumped optical parametric oscillators (1995)
    Springer
    Applied physics 60 (1995), S. 411-420 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 42.65.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent work on the development of high-repetition-rate, synchronously pumped picosecond and femtosecond Optical Parametric Oscillators (OPOs) is reviewed. With KTP, BBO or LBO crystals and solid-state pumps such as cw mode-locked Ti:Sapphire, Nd:YAG or Nd:YLF lasers, the singly resonant OPOs or their nonlinear optical accessories yield pulses as short as 40 fs, average powers up to hundreds of milliwatts, and tunability from 200 nm to 〉 10 µm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081320
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  • 8
    Electronic Resource
    Electronic Resource
    Generation of femtosecond vacuum-ultraviolet pulses (1995)
    Springer
    Applied physics 61 (1995), S. 439-449 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 52.40.Db ; 52.40.Nk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High power femtosecond pulses in the Vacuum Ultra Violet (VUV) have been generated through the nonlinear interaction of femtosecond KrF pulses with xenon and argon gas. Under near resonant two photon excitation of xenon by a femtosecond KrF laser, parametric four wave mixing processes lead to VUV pulses at 147 and 108 nm with pulse energies in the 10 µJ range. Tuning is demonstrated by mixing the KrF pulse with a 500 fs dye laser pulse at 497 nm, resulting in 165 nm emission. In argon, a three photon resonance leads to third harmonic generation at 83 nm and micro joule level pulses near 127 nm generated by a six wave mixing process. Since the spectra of the VUV pulses show an ionization-induced blue shift with increasing KrF laser intensity, the VUV pulses can be shown to have temporal duration less than the pulse width (450 fs) of the KrF laser. Blue shifting of the third harmonic of the KrF laser in argon is dominated by a reduction in the neutral gas density rather than by an increase in the electron density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081272
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  • 9
    Electronic Resource
    Electronic Resource
    Microfacetting of Au(110) electrodes: An optical second-harmonic generation study (1995)
    Springer
    Applied physics 60 (1995), S. 121-125 
    Details
    ISSN: 1432-0630
    Keywords: 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The formation and lifting of microfacetting at an Au(110) electrode surface was studied by using in-situ optical Second-Harmonic Generation (SHG). In contrast to the unreconstructed (1×1) Au(110) surface which has aC 2v symmetry, the reconstructed surface exhibits aC s symmetry due to essentially (111)-oriented microfacets. Hence, it shows SHG-anisotropy patterns fundamentally different to those of a non-reconstructed surface. Apparently, the nonlinear susceptibility tensor contains an additional threefold symmetry element. Its amplitude was determined using Fourier analysis of SHG-anisotropy curves and, thus, served as a measure of microfacetting of the Au(110) surface. We observed that adsorption of an organic molecule, such as pyridine, has little effect on the electrode-surface crystallography. In contrast, adsorption of bromide ions results in the lifting of microfacetting as indicated by the disappearence of the threefold symmetry term. Potential-step experiments gave time constants for the lifting of microfacetting in the range of 〈 τ1/2〈150 ms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538235
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  • 10
    Electronic Resource
    Electronic Resource
    SHG studies of magnetization effects on polycrystalline nickel surfaces (1995)
    Springer
    Applied physics 60 (1995), S. 203-208 
    Details
    ISSN: 1432-0630
    Keywords: 42.65.Ky ; 75.30.Pd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The influence of surface magnetization of polycrystalline nickel samples on Second-Harmonic Generation (SHG) in reflection was investigated using pleosecond laser pulses of 600 nm. The effect was measured for different polarization combinations with samples under normal conditions. For the azimuthal rotation of the magnetization anisotropies of (13±2)% and (19±3)% were observed for s→P and p→P polarization, respectively. The Kerr angle observed by. SHG was found to be an order of magnitude larger (4±1)o than the linear Kerr angle. A hysteresis curve was recorded for p→P polarization. No influence of the oxide layer was noticed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538247
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  • 11
    Electronic Resource
    Electronic Resource
    High-transparency films for nonlinear integrated optics based on P(VDF-TrFE) and poly(α-methyl styrene) host materials (1995)
    Springer
    Applied physics 60 (1995), S. 475-480 
    Details
    ISSN: 1432-0630
    Keywords: 42.65.Ky ; 42.70.Jk ; 42.82.-m ; 77.84.Jd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In search of waveguiding polymer films with both highly efficient NonLinear Optical (NLO) and optimum transmission properties the second harmonic generation of light is measured on poled films of P(VDF-TrFE) blended with 10% PMMA or covered by the polarizable guest-host system PαMS, both pure and doped with 2% NLO dye The PαMS films turn out to be stable electrets after annealing at about 50°C and poling at room temperature. They are thus particularly easily processable candidates for NLO and waveguiding applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538772
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  • 12
    Electronic Resource
    Electronic Resource
    Separation of interface and bulk contributions in second-harmonic generation from magnetic and non-magnetic multilayers (1995)
    Springer
    Applied physics 60 (1995), S. 103-111 
    Details
    ISSN: 1432-0630
    Keywords: 42.65.Ky ; 75.70.Cn ; 78.66.-w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We discuss the separation problem of bulk vs interface contributions in optical Second-Harmonic Generation (SHG). A new method is presented, which — in special cases — provides a full separation of all interface and bulk tensor components. The method is based on measurements in a thin-film geometry, and the relation between two bulk tensor components obtained from group-theoretical arguments. The separation problem in its strict sense is shown to be absent in Magnetization-induced SHG (MSHG). Though, in practice, also in the MSHG case interface and bulk contributions can be closely resemblant. The approach is illustrated by second-harmonic experiments on C60 thin films. SHG in this system is found to be completely dominated by bulk processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538233
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  • 13
    Electronic Resource
    Electronic Resource
    Studies of interfacial regions by sum-frequency generation with a free-electron laser (1995)
    Springer
    Applied physics 60 (1995), S. 113-119 
    Details
    ISSN: 1432-0630
    Keywords: 41.60.Cr ; 42.60.By ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The use of a Free-Electron Laser (FEL) allows the study of (non)linear optical properties of materials over unsurpassed large spectral intervals. As an example, we report on the use of a FEL as the infrared source in spectroscopic infrared-visible Sum-Frequency Generation (SFG). Employing the extremely wide tunability of the Free-Electron Laser for Infrared eXperiments (FELIX) at Rijnhuizen, we have studied the frequency dependence of the nonlinear susceptibility for sumfrequency generation in gallium phosphide between 20 and 32 μm in great detail. We have developed a shortpulse visible laser system that is highly synchronous with FELIX thereby creating a two-color setup that can be broadly applied. Resonantly enhanced SFG in alphaquartz has been used to study the relative timing stability of FELIX and the synchronized picosecond-laser system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538234
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  • 14
    Electronic Resource
    Electronic Resource
    Probing liquid crystals nonlinearly (1995)
    Springer
    Applied physics 60 (1995), S. 197-202 
    Details
    ISSN: 1432-0630
    Keywords: 42.65.Ky ; 61.30.Eb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Optical second-harmonic generation has been used to study the anisotropic orientation behavior of liquid-erystal siloxane molecules embedded in a nematic and/or ferroelectric host matrix. All of the studied guest-host systems show an exceedingly high degree of in-plane anisotropy along the direction of the rubbed interior polyimide layer of the surface-stabilized liquid-crystal sample cell. Alongitudinally applied electrical field leads to susceptibility components exceeding 1 pm/V for a poled sample cell of 5 μm thickness containing 10% by weight of the siloxane guest in a nematic matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538246
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  • 15
    Electronic Resource
    Electronic Resource
    Nonlinear electronic response and SHG from adsorbates on simple metal surfaces (1995)
    Springer
    Applied physics 60 (1995), S. 127-130 
    Details
    ISSN: 1432-0630
    Keywords: 78.66.Bz ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract For the chemisorption model of Lang and Williams, the adsorbate-induced electron density changes in linear and nonlinear order of the field were calculated recently. Based on these calculations the relation between the electronic structure of simple atom/metal systems and the process of SHG from surfaces is discussed in terms of relevant factors such as electronegativity, nonlinear atomic polarizability, work-function change, and metal response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538236
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  • 16
    Electronic Resource
    Electronic Resource
    High-order harmonic generation in rare gases: a new source in photoionization spectroscopy (1995)
    Springer
    The European physical journal 34 (1995), S. 107-110 
    Details
    ISSN: 1434-6079
    Keywords: 42.65.Ky ; 32.80.Rm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We demonstrate that we can use the extreme ultraviolet radiation produced by high order harmonic generation to perform photoionization experiments. With harmonics from the 11th to the 69th of a 140 fs Cr:LiSAF laser operating at 825 nm, we measure the relative photoionization cross sections of xenon, krypton, argon and neon over the range 10 to 110 eV. With narrow bandwidth harmonics produced by a tunable, 1 ps dye laser, we observe the autoionizing states between the 4p 5 ionization thresholds in krypton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439384
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